Improvement in saw-mills



UNITED STATES PATENT OFFICE.

LEVI W. POND, OF EAU CLAIRE, WISCONSIN, ASSIGNOR OF ONE-HALF HIS RIGHTTO EAU CLAIRE LUMBER COMPANY.

IMPROVEMENT IN SAW-MILLS.

Specification forming part of Letters Patent No. 160,348, dated March 2,1875; application filed June 15, 1874.

To all whom it may concern:

Be it known that I, LEVI W. POND, of Eau Claire, in the county of EauClaire and State of WVisconsin, have invented new and usefulImprovements in Saw-Mills, of which the following is a full description,reference being had to the accompanying drawings, in which Figure l is atop or plan view; Fig.2, a crosssection on line a: of Fig. 1; and Fig.3, a section of the side rail, showing the lever and its connections.

The object of my invention is to give the saw-shaft end play, to adjustthe line of the saw, and to give the saw-shaft a yielding or adjustableendwise support; and its nature consists in providing the saw-shaft witha collar between the'journal-bearings, said collar turning in a head orhalf-box supported upon an adjust-able and yielding cross-bar.

In the drawings, A represents the frame; B, the saw-shaft; G, thejournal boxes or bearings; D, the saw; E, the head or half-box; F, theyielding spring or yielding crossbar; G, the sliding bar for moving thecrossbarF; H, the brace; I, the IGVGDSFIIILIP; J, the sup porting pivotor fulcrum for the lever K; K, the lever; L, the screw-shaft M, the nut,to which the outer end of the yielding bar F is connected; N, thesupports or journals for the screw-shaft 0, the saw-guide a, the collaron the saw-shaft; b, the mortise in the frame, through which the end ofthe yielding cross-bar F passes; c, the slot or opening for insertingthe bar F; cl, the slots in the sliding bar G; e, the screws passingthrough the slots 61 and supporting the sliding bar Gr; f, pivoted boltof the bar F; g, the pivot for the head E.

The frame A is made in any suitable manner and provided with a suitablesaw-guide, O. The saw D is attached to the shaft in any suitable orWell-known way, and the shaft is hung in any suitable journal boxes orbearing. Between the journalboxes I place a collar, a, on the shaft B,and firmly attach it thereto, or it may be made a part of the shaft.This collar turns in a recess made to fit it in the head E. The head Eis attached to the cross-bar F, which is pivoted at f to one side of theframe, and on the opposite side passes through an elongated mortise, b,in the frame, and is provided at the outer end with a screwnut, M,through which nut the screw-shaft L passes, and is turned by means of abutton or other suitable device at the end.

The run of the saw can be adjusted by means of the screw-shaft L, andfor the purpose of this operation the cross-bar or lever F may be maderigid, and will be found useful without further addition; but, in orderto give the saw a yielding movement endwise, I make the bar F so that itwill spring to some extent; and, as the head E is attached, by means ofthe brace or bar H, to the sliding bar G, this construction will permitof end play of the shaft B. The end play may also be forced by means ofthe lever K, which is pivoted at J and passes through the stirrup I ofthe bar or bars G H, so that, by moving this lever K to the right orleft, the position of the head E will be changed accordingly, and withit the run of the saw.

Two collars, a, may be placed on the shaft, and the head E made to workbetween them, instead of being grooved, as shown, and, by extending theshaft B beyond the journalboxes, it maybe appliedto the end, instead ofbetween, as shown.

The head E is attached to the bar F by 'a single pivot, g, centrallylocated, so as to prevent binding.

The spring-bar F should be strong enough to prevent any lateralvibration or trembling of the saw, but sufficiently yielding to allowthe saw to give in either direction when crowded.

What I claim as new is as follows:

1. The pivoted bar F, in combination with the nut M and screw-shaft L,substantially as and for the purpose described.

2. The combination of the movable or spring bar F with the sliding barG, brace or bar 1:1, lever K, and stationary saw-guide O, substantiallyas and for the purposes set forth.

3. The combination, in a saw-frame, of the saw-mandrel B, provided withone or more collars, a, with the movable or spring bar F, nut M,screw-shaft L, sliding bar G or H, and lever K, substantially asspecified.

LEVI W. POND.

WVitnesses:

E. A. WEST, O. W. BOND,

